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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19de88e8e2a9fd98bebaddb424429e7fe36d9ca29c72ce2157c5749d16c9cc67' 
  AND token = '3shNBEqGW2wAMibfnB+Sa5RZtlsy0vxaZ/X9Knba5bs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}